File crash-search-also-in-lib-crash of Package crash

From: Bernhard Walle <bwalle@suse.de>
Subject: [PATCH] Add /usr/lib{,64}/crash to the search path for extensions
Patch-mainline: never

This patch just adds /usr/lib{,64}/crash to the search path for extensions.
This allows extensions to be installed in that directories to confirm
to the shared library packaging policy of SUSE.



Signed-off-by: Bernhard Walle <bwalle@suse.de>

---
 defs.h       |    1 +
 extensions.c |   12 ++++++++++++
 symbols.c    |   22 ++++++++++++++++++++++
 3 files changed, 35 insertions(+)

--- a/defs.h
+++ b/defs.h
@@ -3295,6 +3295,7 @@ void dump_symbol_table(void);
 void dump_struct_table(ulong);
 void dump_offset_table(char *, ulong);
 int is_elf_file(char *);
+int is_elf_file_in_dir(const char *file, const char *dir);
 int is_kernel(char *);
 int file_elf_version(char *);
 int is_system_map(char *);
--- a/extensions.c
+++ b/extensions.c
@@ -210,8 +210,20 @@ load_extension(char *lib)
 	*  If the library is not specified by an absolute pathname, dlopen() 
         *  does not look in the current directory.
         */
+
+	/* add .so if necessary */
+	if (strlen(lib) <= 3 || strcmp(lib + strlen(lib) - 3, ".so") != 0) {
+		char *lib2 = strdup(lib);
+		sprintf(lib, "%s.so", lib2);
+		free(lib2);
+	}
+
 	if ((*lib != '.') && (*lib != '/') && is_elf_file(lib)) 
 		sprintf(ext->filename, "./%s", lib);
+	else if (is_elf_file_in_dir("/usr/lib/crash", lib))
+		sprintf(ext->filename, "%s/%s", "/usr/lib/crash", lib);
+	else if (is_elf_file_in_dir("/usr/lib64/crash", lib))
+		sprintf(ext->filename, "%s/%s", "/usr/lib64/crash", lib);
 	else
 		strcpy(ext->filename, lib);
 
--- a/symbols.c
+++ b/symbols.c
@@ -2604,6 +2604,28 @@ bailout:
 	return(is_bfd_format(file));
 }
 
+
+/*
+ * Checks if file <file> in dir <dir> is a valid ELF file.
+ */
+int
+is_elf_file_in_dir(const char *dir, const char *file)
+{
+	char *buffer;
+	int  ret;
+
+	buffer = malloc(strlen(dir) + strlen(file) + 2);
+	if (!buffer)
+		return FALSE;
+
+	sprintf(buffer, "%s/%s", dir, file);
+
+	ret = is_elf_file(buffer);
+	free(buffer);
+
+	return ret;
+}
+
 /*
  *  Given a choice between two namelists, pick the one for gdb to use.
  *  For now, just check get their stats and check their sizes; the larger